Electric-arc lamp.



No. 662,931. Patented Dec. 4, I900. F. A. GILBERT 81. E. 0. LUNDIN.

ELECTRIC ARC LAMP.

, (Applicltion filecljfuly 22. 1898.)

(No Modal.)

, n 14mm in UNITED STATEs PATENT CEEIQE.

FREDERICK A. GILBERT, CF BRCOKLINE, AND EMIL C. LUNDIN, OF BEACH- MONT, MASSACHUSETTS, ASSIGNORS TO THE GENERAL ELECTRIC COM- PANY, OF NEW YORK,

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 662,931, dated December 4, 1900.

Application filed July 22, 1898. Serial No. 686,676. (No model.)

To aZZ whom, it may concern: partly broken out an arc-lamp with clutch Be it known that we, FREDERICK A. GIL- mechanism emboc'lying our invention applied BERT, of Brookline, county of Norfolk, and thereto, the outer globe and the lamp-case be- EMILO.LUNDIN, of BeachmontmouhtyofSufing shown in section. Fig. 2 is an enlarged folk, State of Massachusetts, have invented side view of the clutch mechanism with the 55 an Improvement in Electric-Arc Lamps, of parts in position to release the carbon. Fig. Whichthefollowing descriptiomin connection 3 is a side elevation thereof, partly broken with the accompanying drawings, is a speciout, the carbon-receiving tube being shown fication, like characters on the drawings repin section; and Fig. 4 shows the clutch mech- IO resenting like parts. anism in position to release the metallic car- 60 This invention relates more especially to rier at the upper end of the carbon. thattype of electric-arclampswhereincarbon- Referring to Fig. 1, the open body A, the

rods are dispensed with, the upper carbon beseries-wound and shunt coils, the latter being carried by and longitudinally movable in ing shown at I, the outer globe G its supa tubular receiver or holder, one form of such porting-socket A", the inner-globe G, the tubu- 6 type of lamp being shown in United States lar receiver R for the upper carbon extend- Patent No. 603,630, dated May 10, 1898, to ing through the open body. A and passing which reference may be had. freely through its base A, and the resistance Our present invention has for its more par- R R may be and are all substantially as in ticular object the production of novel clutch United States Patent No. 603,630, referred to, 70 mechanism for the upper carbon, which not the same letters representinglike parts hereonly controls the feed of the carbon, but also in. As in the said patent, the clutch mechprevents lateral movement thereof, while at anism is controlled by the movement of the the same time simplifying the construction tubular receiver B for the upper carbon L,

and arrangement of the parts. In arc-lamps the carrier for the latter being'shown in Fig. 75 of the type referred to it is now common to 4; as a short metal tube a, tapered at itslower provide some form of guide for the carbon end at a and embracing the upper end of the extraneous to the clutch mechanism, either carbon. This carrier slides loosely and freely as a member located some distance below the in the tube 13 and is electrically connected 3o clutch mechanism or cooperating with the through the metal body of the lamp with the 80 said mechanism to guide it and prevent latline-wire Z, as in the patent referred to. eral movement. In either construction the. The clutch mechanism comprises, essenuse of a crooked carbon results in the hind tially, two relatively movable yoke-like memi ing or jamming of the clutch, preventing its bers mounted on the tube B, one being fixed 3 5 operation, or the carbon will be fed off to one thereupon, bell-crank levers being pivoted 85 side of the lower carbon, cutting off the are. on one member and connected by links with y We have obviated these objectionable tea the other, clamping-jaws being fulcrumed on tures by mounting the clutch mechanism the lower ends of the lovers. As herein wholly upon the tubular carbon-receiver, so shown, a split yoke-like member (Z is clamped 40 that being concentric therewith at all times by a suitable screw 2 upon the tube B a short 0 it cannot become jammed by reason of a distance above its lower end, said member crooked carbon, and the construction of the having diametrically opposite ears cl, on clutch mechanism is such that a firm lateral which are fulcruined two links d the lower support is given to the carbon, compelling its free ends of which are in turn jointed to the feed movement in proper alinement with the upper divergent arms of bell-crank levers (Z 5 lower carbon. pivotally mounted at d in a second yoke-like Various other features of our-invention will member. This member comprises a hub f, be hereinafter described in the specification, which embraces and is adapted to slide upon and particularly pointed out in the claims. the end of the tube B below the member (Z,

Figure 1 represents in side elevation and the hub having rigidly secured to or forming Ioo to the lower ends of the bell-crank levers within the yoke-arms hen the tube is lifted, the links cZ' act upon the outer ends of the levers d causing their short arms to move down and inward to thereby clamp the jaws firmly upon the upper carbon and lift it, separating it from the lower carbon and forming the arc, the weight of the hub f tending to always move it toward the lower end of the tube B in clamping position.

A cross-bar h is shown as secured to the depending rods A which support the globesocket A below the clutch mechanism, said bar having a central aperture for the upper carbon, while a hub h is secured to or formed on the upper side of the bar around the aperture. This hub has an annular upturned flange 7L2, which is in the path of the lower ends of the jaws d, and when the tube B descends far enough the said flange engages the jaws and stops their downward movement, as well as the downward movement of the yoke, unclamping the carbon, as the continued movement of the tube B causes the link (F to operate the bell-cran k levers (Z and open the jaws.

By mounting the clutch mechanism wholly upon the tube B the jaws d are always concentric with the tube and they cannot become jammed by a crooked carbon, while the rigid supports f for the jaw-carrying levers (Z at each side of the carbon serve to positively po sition and guide it, preventing any improper lateral movement thereof, the whole clutch mechanism partaking of all lateral movement, if any, of the tube B.

When the carbon-carrier (0 comes between the clamping-jaws, they are more widely separated and lifted, owing to the larger external diameter of the carrier, so that the flange 7L2 would not engage the jaws until the tube B had moved farther than when the jaws were in engagement with the carbon. In order therefore to release the clutch without such increased movement of the carbon-receiving tube, the hub 7L is provided with two upturned lugs 7L3, which are so located as to strike the short arms of the bell-crank levers d very near their fulcra (Z when the jaws engage the carrier a, as shown in Fig. The

lugs b thus effect the releasing movement of the jaws much more mpidly than would the flange 7L2 acting on the jaws themselves and with a consequent reduced movement of the controlling-tube B.

From the foregoing description it will be seen that we have dispensed altogether with any guide for the carbon extraneous to the clutch mechanism, the latter serving to guide laterally as well as to control the feed movement of the carbon.

Our invention is not restricted to the pre cise construction and arrangement of parts as herein shown, as the same may be varied without departing from the spirit and scope of the invention.

' Having described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. in an electric-arc lamp, a tube for receiving and permitting vertical movement therein of the upper carbon, a clutch mounted wholly upon said tube, and means for preventing lateral movement of the clutch relatively to the axis of the tube.

2. In an electrioarc lamp, a tube for the upper carbon, a support mounted to slide upon said tube and having opposite, depending arms, and clamping means for the carbon, pivotally mounted on said arms below the tube and preventing lateral movement of the carbon.

3. In an electric-arc lamp, a tube for the upper carbon, and clutch mounted wholly on said tube, the clutch including clampingjaws for the carbon, and a supporting mom-- her for said jaws, concentric with and longitudinally guided by the tube and movable thereon, to control the feed of and position the carbon laterally.

t. In an electric-arc lamp, a tube for receiving and permitting vertical movement therein of the upper carbon, clutch mechanism including two relatively-movable members mounted on the tube one in sliding relation thereto, jaws carried by one of said members below the end of the tube, to engage the carbon, and connections between said jaws and the other member, whereby relative movement of said members will cause said jaws to clamp or release the carbon.

5. In an electric-arc lamp, a tubular receiver for and in which the upper carbon is .vertically movable, and a clutch mounted wholly upon the receiver, said clutch comprising a yoke adapted to slide on the receiver and having lateral arms depending below the tube, bell-crank levers fnlcrumed on said arms, clampingjaws pivotally mounted on said levers and adapted to clamp the carbon, and operating-links pivotally connected with the outer ends of the levers and to the tubular receiver.

0. in an electric-arc lamp, a tube to receive and permit vertical movement therein of the upper carbon, and a clutch mounted wholly upon the tube, said clutch comprising clamping means for the carbon, a support therefor mounted to slide on the tube, connections between said clamping means and the tube, fulcrumed upon the latter, and a fixed stop to engage said clamping means and move the support on the tube, to thereby release the carbon.

7. In an electricarc lamp, a tube to receive and permit vertical movement therein of the upper carbon, and a clutch mounted 'wholly upon the tube, said clutch com prising clamping -jaws for the carbon, levers upon which the jaws are pivoted, a support for said levers, mounted to slide upon the tube, links connecting the tube and the outer ends of the latter, a fixed stop to normally engage the jaws and move the support on the tube, to release the carbon, and auxiliary means to engage and move the levers when the jaws are in engagement with and more widely separated by the carrier attached to the upper end of the carbon.

8. In an electric-arc lamp, a carbon-receiving tube, and a clutch mechanism consisting of two relatively-movable yoke-like members mounted upon said tube one in sliding relation thereto,bell-cran k levers pivotally mounted on one member and having clamping-jaws pivoted upon their lower ends, and links fulcrumed at one end on the other yoke-like member and pivotally connected at their other ends with the upper portions of said levers.

9. In an electric-arc lamp, a movable tubular controlling member for the upper carbon, and in which the latter is vertically movable, a clutch mechanism carried Wholly by said controlling member, the clutch being positively held against lateral shifting, and a fixed stop mounted independently of and to engage the clutch mechanism to release the carbon.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

FREDERICK A. GILBERT. EMIL O. LUNDIN.

Witnesses:

L. M. WALLAcE, CHARLES A. SNOW. 

